809812043 has 2 divisors, whose sum is σ = 809812044. Its totient is φ = 809812042.

The previous prime is 809811997. The next prime is 809812061. The reversal of 809812043 is 340218908.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 809812043 - 2¹⁴ = 809795659 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 809811994 and 809812012.

It is not a weakly prime, because it can be changed into another prime (809812063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404906021 + 404906022.

It is an arithmetic number, because the mean of its divisors is an integer number (404906022).

Almost surely, 2^809812043 is an apocalyptic number.

809812043 is a deficient number, since it is larger than the sum of its proper divisors (1).

809812043 is an equidigital number, since it uses as much as digits as its factorization.

809812043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 809812043 is about 28457.1966820346. The cubic root of 809812043 is about 932.0976442208.

The spelling of 809812043 in words is "eight hundred nine million, eight hundred twelve thousand, forty-three".